Onychomycosis, or fungal infection of the nail, most often affects the toenails. Infected nails usually have a thick, yellow appearance and can become coarse and brittle (see Figure 4).

These include pulling, picking, biting, or scraping one's hair, skin, or nails. The disorders include trichotillomania (compulsive hair pulling), dermatillomania (compulsive skin picking ...

Parakeratosis pustulosa (PP) is a cause of distal nail inflammation and nail dystrophy that affects a single digit. It is nonpruritic and minimally painful. This distal digital dactylitis is ...